My interview in October was not low stress. I had an interview with two professors at the same time: One a professor of Neuroanatomy and the other, Biochemistry.
The Biochemistry professor was trying to provoke me. He seemed bored at times, argumentatively asked me to defend weaknesses in my record, and kept his head down reading my file. At one point, he even loudly and repeatedly circled something in the notes he was taking! I have no idea what I said that was so noteworthy. Don't let the attitude throw you off. It seemed like he was just looking for my initial reaction.
The Neuroanatomy professor, on the other hand, smiled, made good eye contact, and even validated one of my defending answers to a question by the Biochemistry professor. There was also a question about what would I do if I had a 12 year old patient, pregnant from her father, asking for birth control. They are looking for your thinking, not necessarily a right or wrong answer. He even gave me positive feedback (i.e. "Good answer!")
When I spoke with other interviewees afterwards, they said that the roles were reversed during their interview: the Neuroanatomy professor was antagonistic, and the Biochemistry professor was kind.
After the interviews, when the Biochem professor talked to all of us about the curriculum, his personality was surprisingly less hostile.
You get a certified letter approximately a week later.
Good luck!
